I2C Registers
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21.4.1.31 I2C_SBLOCK Register (offset = D4h) [reset = 0h]
I2C_SBLOCK is shown in Figure 21-46 and described in Table 21-39.
This read/write register controls the automatic blocking of I2C clock feature in slave mode. It is used for
the Local Host to configure for which of the 4 own addresses, the core must block the I2C clock (keep
SCL line low) right after the Address Phase, when it is addressed as a slave.
Figure 21-46. I2C_SBLOCK Register
31 30 29 28 27 26 25 24
Reserved
R-0h
23 22 21 20 19 18 17 16
Reserved
R-0h
15 14 13 12 11 10 9 8
Reserved
R-0h
7 6 5 4 3 2 1 0
Reserved OA3_EN OA2_EN OA1_EN OA0_EN
R-0h R/W-0h R/W-0h R/W-0h R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 21-39. I2C_SBLOCK Register Field Descriptions
Bit Field Type Reset Description
31-4 Reserved R 0h
3 OA3_EN R/W 0h Enable I2C clock blocking for own address 3.
When the CPU sets a bit location to 1, if an external master using
the corresponding own address addresses the core, the core will
block the I2C clock right after the address phase.
For releasing the I2C clock the CPU must write 0 in the
corresponding field.
Value after reset is low.
0x0 = I2C clock released
0x1 = I2C clock blocked
2 OA2_EN R/W 0h Enable I2C clock blocking for own address 2.
When the CPU sets a bit location to 1, if an external master using
the corresponding own address addresses the core, the core will
block the I2C clock right after the address phase.
For releasing the I2C clock the CPU must write 0 in the
corresponding field.
Value after reset is low.
0x0 = I2C clock released
0x1 = I2C clock blocked
1 OA1_EN R/W 0h Enable I2C clock blocking for own address 1.
When the CPU sets a bit location to 1, if an external master using
the corresponding own address addresses the core, the core will
block the I2C clock right after the address phase.
For releasing the I2C clock the CPU must write 0 in the
corresponding field.
Value after reset is low.
0x0 = I2C clock released
0x1 = I2C clock blocked
3766
I2C SPRUH73H–October 2011–Revised April 2013
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